The nurse is caring for a group of clients. Which situation describes prophylactic therapy?

A. A client received a medication to prevent nausea from occurring: Prophylactic therapy involves administering a drug to prevent a condition or symptom before it develops. Giving an antiemetic before a procedure or chemotherapy to prevent nausea exemplifies preventive use, reducing the risk of adverse effects before they occur. B. A client received a medication to replace insulin in their body: Insulin replacement is considered replacement therapy, not prophylactic therapy. It provides an essential hormone that the body cannot produce, maintaining metabolic function rather than preventing a condition. C. A client received a medication to treat a diagnosed infection: Treatment of an existing infection is therapeutic, not prophylactic. Prophylactic therapy occurs before a problem develops, whereas treating an active infection addresses an already established condition. D. A client received a medication to slow the progression of arthritis: Medications that slow disease progression are considered disease-modifying therapy. While they may prevent worsening, they do not serve the primary purpose of preventing a symptom or condition before it occurs.